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Possible generation of heat from nuclear fusion in Earth ’ s inner core

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ABSTRACT

The cause and source of the heat released from Earth’s interior have not yet been determined. Some research groups have proposed that the heat is supplied by radioactive decay or by a nuclear georeactor. Here we postulate that the generation of heat is the result of three-body nuclear fusion of deuterons confined in hexagonal FeDx core-centre crystals; the reaction rate is enhanced by the combined attraction effects of high-pressure (~364 GPa) and high-temperature (~5700 K) and by the physical catalysis of neutral pions: 2D + 2D + 2D → 21H + 4He + 2  + 20.85 MeV. The possible heat generation rate can be calculated as 8.12 × 1012 J/m3, based on the assumption that Earth’s primitive heat supply has already been exhausted. The H and He atoms produced and the anti-neutrino are incorporated as Fe-H based alloys in the H-rich portion of inner core, are released from Earth’s interior to the universe, and pass through Earth, respectively.

No MeSH data available.


Substoichiometric FeDx crystal with all octahedral D sites (small red circles) and all tetrahedral vacancy sites (small yellow circles) in an Fe (large white circles) hexagonal close-packed (hcp) lattice at 332 GPa and 4820 K near the inner core centre.The blue thick lines represent chains (Fe−tetrahedral-site vacancy – octahedral-site D−tetrahedral-site vacancy−Fe) along [3 3 · 1] directions. The atomic sizes are not necessarily to scale.
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f1: Substoichiometric FeDx crystal with all octahedral D sites (small red circles) and all tetrahedral vacancy sites (small yellow circles) in an Fe (large white circles) hexagonal close-packed (hcp) lattice at 332 GPa and 4820 K near the inner core centre.The blue thick lines represent chains (Fe−tetrahedral-site vacancy – octahedral-site D−tetrahedral-site vacancy−Fe) along [3 3 · 1] directions. The atomic sizes are not necessarily to scale.

Mentions: Next we consider the driving force responsible for the close proximity of deuterons. Because maximum hydrogen solubility of the Fe-based alloy composing the centre core is 25 at% H21, we applied the model of the octahedral occupied deuterated iron FeDx (x < 0.25) lattice illustrated in Fig. 1, which considers the Fe-based alloy as Fe. The stable structure of metal-hydrogen alloys under high pressures and high temperatures favours interstitial sites with superabundant vacancies (vacancy-hydrogen clusters)31. Measurement of the defect trapping of D implanted in Fe indicates that the D atom moved from the near-octahedral interstitial site to another site32. The atoms along six [3 3 · 1] directions (blue thick lines) at 332 GPa and 4820 K are lined up in chains as follows: Fe―tetrahedral-site vacancy―octahedral-site D―tetrahedral-site vacancy―Fe. The interstitial deuterons in the FeDx are immersed in a sea of conduction electrons derived from Fe atoms. Charge density wave (CDW) instability occurs mostly in materials in which the atoms are lined up in chains. When hexahedral distortion of the sublattice trihedral deuterons (dotted green line) modulates the charge transfer in the chains (i.e., alternating tetrahedral D+δ-Fe8-δ array33), the breathing-mode-like displacement of deuterons occurs along the [3 3 · 1] directions (Supplementary Information 4).


Possible generation of heat from nuclear fusion in Earth ’ s inner core
Substoichiometric FeDx crystal with all octahedral D sites (small red circles) and all tetrahedral vacancy sites (small yellow circles) in an Fe (large white circles) hexagonal close-packed (hcp) lattice at 332 GPa and 4820 K near the inner core centre.The blue thick lines represent chains (Fe−tetrahedral-site vacancy – octahedral-site D−tetrahedral-site vacancy−Fe) along [3 3 · 1] directions. The atomic sizes are not necessarily to scale.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5120317&req=5

f1: Substoichiometric FeDx crystal with all octahedral D sites (small red circles) and all tetrahedral vacancy sites (small yellow circles) in an Fe (large white circles) hexagonal close-packed (hcp) lattice at 332 GPa and 4820 K near the inner core centre.The blue thick lines represent chains (Fe−tetrahedral-site vacancy – octahedral-site D−tetrahedral-site vacancy−Fe) along [3 3 · 1] directions. The atomic sizes are not necessarily to scale.
Mentions: Next we consider the driving force responsible for the close proximity of deuterons. Because maximum hydrogen solubility of the Fe-based alloy composing the centre core is 25 at% H21, we applied the model of the octahedral occupied deuterated iron FeDx (x < 0.25) lattice illustrated in Fig. 1, which considers the Fe-based alloy as Fe. The stable structure of metal-hydrogen alloys under high pressures and high temperatures favours interstitial sites with superabundant vacancies (vacancy-hydrogen clusters)31. Measurement of the defect trapping of D implanted in Fe indicates that the D atom moved from the near-octahedral interstitial site to another site32. The atoms along six [3 3 · 1] directions (blue thick lines) at 332 GPa and 4820 K are lined up in chains as follows: Fe―tetrahedral-site vacancy―octahedral-site D―tetrahedral-site vacancy―Fe. The interstitial deuterons in the FeDx are immersed in a sea of conduction electrons derived from Fe atoms. Charge density wave (CDW) instability occurs mostly in materials in which the atoms are lined up in chains. When hexahedral distortion of the sublattice trihedral deuterons (dotted green line) modulates the charge transfer in the chains (i.e., alternating tetrahedral D+δ-Fe8-δ array33), the breathing-mode-like displacement of deuterons occurs along the [3 3 · 1] directions (Supplementary Information 4).

View Article: PubMed Central - PubMed

ABSTRACT

The cause and source of the heat released from Earth&rsquo;s interior have not yet been determined. Some research groups have proposed that the heat is supplied by radioactive decay or by a nuclear georeactor. Here we postulate that the generation of heat is the result of three-body nuclear fusion of deuterons confined in hexagonal FeDx core-centre crystals; the reaction rate is enhanced by the combined attraction effects of high-pressure (~364&thinsp;GPa) and high-temperature (~5700&thinsp;K) and by the physical catalysis of neutral pions: 2D&thinsp;+&thinsp;2D&thinsp;+&thinsp;2D&thinsp;&rarr;&thinsp;21H&thinsp;+&thinsp;4He&thinsp;+&thinsp;2&thinsp;&thinsp;+&thinsp;20.85&thinsp;MeV. The possible heat generation rate can be calculated as 8.12&thinsp;&times;&thinsp;1012&thinsp;J/m3, based on the assumption that Earth&rsquo;s primitive heat supply has already been exhausted. The H and He atoms produced and the anti-neutrino are incorporated as Fe-H based alloys in the H-rich portion of inner core, are released from Earth&rsquo;s interior to the universe, and pass through Earth, respectively.

No MeSH data available.